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madt: add support for table flags #48

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madt: add support for table flags #48

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22 changes: 21 additions & 1 deletion src/madt.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -17,6 +17,11 @@ type U16 = byteorder::U16<LE>;
type U32 = byteorder::U32<LE>;
type U64 = byteorder::U64<LE>;

#[repr(u32)]
enum MadtFlags {
PcAtCompat = 1 << 0,
}

#[repr(u8)]
enum MadtStructureType {
ProcessorLocalApic = 0x0,
Expand Down Expand Up @@ -98,6 +103,20 @@ impl MADT {
}
}

pub fn pc_at_compat(mut self) -> Self {
self.set_flag(MadtFlags::PcAtCompat);
self
}

fn set_flag(&mut self, flag: MadtFlags) {
let old_flags = self.header.flags.get();
self.header.flags |= flag as u32;

self.checksum.delete(old_flags.as_bytes());
self.checksum.append(self.header.flags.as_bytes());
self.header.table_header.checksum = self.checksum.value();
}

fn update_header(&mut self, data: &[u8]) {
let len = data.len() as u32;
let old_len = self.header.table_header.length.get();
Expand Down Expand Up @@ -671,7 +690,8 @@ mod tests {
*b"DECAFCOF",
0xdead_beef,
LocalInterruptController::Riscv,
);
)
.pc_at_compat();
check_checksum(&madt);
assert_eq!(Header::len(), get_size(&madt));
}
Expand Down
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